Neither the fob or the unlock buttons in the front seats will unlock the back hatch. When you pull up on the handle to open the hatch it just "free floats" and there is no engagement of any lock. There is no way to open the hatch manually either. Using the key that would unlock the top window doesn't work either.
SOURCE: 2005 gmc yukon back passenger doors will not
My wife's 2003 Yukon wouldn't lock the rear doors or hatch, but it would unlock. My problem was the lock relay was bad. There are two relays, one for lock and one for unlock. They are located in the fuse panel on the left side of the console. Open the drivers door and you will see a cover that pops off. Behind this are several fuses and relays. Consult your manual to see which is the lock and unlock relays. They are side by side on a 2003. They pull straight out. I replaced both and they were around $10 apiece at any auto store.
SOURCE: 2006 gmc yukon back door/hatch won't unlock
Check battery voltage. if above 13.7 volts move to rear lock actuator and measure battery voltage at actuator if above 13.6
replace actuator if below specs. check grounds and alternator out put as follows, alternator output 13.7 to 14.25 volts. key off battery volts should be 12.90 + - 3/10 of a volt and about the same voltage at the actuator. let me know. kindest regards Bill
SOURCE: 2006 GMC Yukon Denali XL Rear Hatch & Glass locks not working
Could be the latch mechanism for the door is sticking. You could try using some white grease on the latch and the contact where the latch hooks to. You can purchase the grease from most auto parts stores. You will not need to use alot. Just apply a small amount to the mechanisim and then work it in using the manual handle. Then open and close the door several times to feel the "action". Then apply a little more and repeat. This should loosen the latch and get it working again. Also make sure that none of the tension springs have come loose on the latch. And check the seal around the door and make sure it is not pinched and has a proper fit.
SOURCE: My GMC 2005 Yukon XL
Here is a link on how to fit your rear hatch issues.
http://gmcowners.com/gmc-forum/showthread.php?t=12619
Thank you for using fixya.
SOURCE: Yukon xl rear door won't unlock and there is no manual lock.
I have the exact problem described. I can't find any brass contacts on the door frame of any door. What door are you referring to? The liftgate is closed and locked, so I can't get to that door frame.
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